The use of composting as the pre treatment have several disadvantages.Instead of selective removal of lignin the hemicelluose and cellulose are significantly lost as well as the long processing time , the need for mixed inoculations and also as the problem of contamination.
Surley yet this method can be apropriate for rural areas
sd
Pannirselvam
/18/05, Rich <[EMAIL PROTECTED]> wrote:
> I am looking at the second chapter of Mother Earth Alcohol Fuel -Raw
> materials chapter at
> http://journeytoforever.org/biofuel_library/ethanol_motherearth/meCh2.html#2_1.
> At the "Crop Residue" part, it says:
>
> "The "backbone" of sugar and starch crops -- the stalks and leaves -- is
> composed mainly of cellulose. The individual six-carbon sugar units in
> cellulose are linked together in extremely long chains by a stronger
> chemical bond than exists in starch. As with starch, cellulose must be
> broken down into sugar units before it can be used by yeast to make ethanol.
> However, the breaking of the cellulose bonds is much more complex and costly
> than the breaking of the starch bonds. Breaking the cellulose into
> individual sugar units is complicated by the presence of lignin, a complex
> compound surrounding cellulose, which is even more resistant than cellulose
> to enzymatic or acidic pretreatment. Because of the high cost of converting
> liquefied cellulose into fermentable sugars, agricultural residues (as well
> as other crops having a high percentage of cellulose) are not yet a
> practical feedstock source for small ethanol plants. Current research may
> result in feasible cellulosic conversion processes in the future." I am
> also looking at Stu Campbell's book "LET IT ROT! The gardener's guide to
> composting, Revised edition. My question is since composting does a good
> job of breaking down lignin, would it be possible to use composting as part
> of the ethanol creation process?
>
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>
>
--
Pagandai V Pannirselvam
Universidade Federal do Rio Grande do Norte - UFRN
Departamento de Engenharia Química - DEQ
Centro de Tecnologia - CT
Programa de Pós Graduação em Engenharia Química - PPGEQ
Grupo de Pesquisa em Engenharia de Custos - GPEC
Av. Senador Salgado Filho, Campus Universitário
CEP 59.072-970 , Natal/RN - Brasil
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32171557
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